1 | /* |
---|
2 | ------------------------------------------------------------------------ |
---|
3 | $Id$ |
---|
4 | ------------------------------------------------------------------------ |
---|
5 | |
---|
6 | COPYRIGHT (c) 1997 |
---|
7 | Objective Design Systems Ltd Pty (ODS) |
---|
8 | All rights reserved (R) Objective Design Systems Ltd Pty |
---|
9 | |
---|
10 | The license and distribution terms for this file may be found in the |
---|
11 | file LICENSE in this distribution or at |
---|
12 | http://www.OARcorp.com/rtems/license.html. |
---|
13 | |
---|
14 | ------------------------------------------------------------------------ |
---|
15 | |
---|
16 | See header file. |
---|
17 | |
---|
18 | ------------------------------------------------------------------------ |
---|
19 | */ |
---|
20 | |
---|
21 | #include <rtems++/rtemsInterrupt.h> |
---|
22 | |
---|
23 | /* ---- |
---|
24 | Interrupt Table |
---|
25 | |
---|
26 | This table is used to re-direct the call from RTEMS to a user |
---|
27 | object |
---|
28 | */ |
---|
29 | |
---|
30 | static rtemsInterrupt *interrupt_table[CPU_INTERRUPT_NUMBER_OF_VECTORS]; |
---|
31 | |
---|
32 | // has the table been initialised |
---|
33 | static bool initialised = false; |
---|
34 | |
---|
35 | /* ---- |
---|
36 | rtemsInterrupt |
---|
37 | */ |
---|
38 | |
---|
39 | rtemsInterrupt::rtemsInterrupt() |
---|
40 | : vector(0), |
---|
41 | caught(false), |
---|
42 | old_handler(0), |
---|
43 | old_interrupt(0) |
---|
44 | { |
---|
45 | if (!initialised) |
---|
46 | { |
---|
47 | for (rtems_vector_number vec = 0; |
---|
48 | vec < CPU_INTERRUPT_NUMBER_OF_VECTORS; |
---|
49 | vec++) |
---|
50 | { |
---|
51 | interrupt_table[vector] = 0; |
---|
52 | } |
---|
53 | initialised = true; |
---|
54 | } |
---|
55 | } |
---|
56 | |
---|
57 | rtemsInterrupt::~rtemsInterrupt() |
---|
58 | { |
---|
59 | release(); |
---|
60 | } |
---|
61 | |
---|
62 | const rtems_status_code rtemsInterrupt::isr_catch(const rtems_vector_number vec) |
---|
63 | { |
---|
64 | if (vec >= CPU_INTERRUPT_NUMBER_OF_VECTORS) |
---|
65 | return set_status_code(RTEMS_INVALID_NUMBER); |
---|
66 | |
---|
67 | if (caught) |
---|
68 | return set_status_code(RTEMS_RESOURCE_IN_USE); |
---|
69 | |
---|
70 | old_interrupt = interrupt_table[vector]; |
---|
71 | interrupt_table[vector] = this; |
---|
72 | vector = vec; |
---|
73 | |
---|
74 | set_status_code(rtems_interrupt_catch(redirector, |
---|
75 | vector, |
---|
76 | &old_handler)); |
---|
77 | |
---|
78 | if (successful()) |
---|
79 | caught = true; |
---|
80 | else |
---|
81 | { |
---|
82 | interrupt_table[vector] = old_interrupt; |
---|
83 | old_interrupt = 0; |
---|
84 | old_handler = 0; |
---|
85 | vector = 0; |
---|
86 | } |
---|
87 | |
---|
88 | return last_status_code(); |
---|
89 | } |
---|
90 | |
---|
91 | const rtems_status_code rtemsInterrupt::release(void) |
---|
92 | { |
---|
93 | if (caught) |
---|
94 | { |
---|
95 | set_status_code(rtems_interrupt_catch(old_handler, |
---|
96 | vector, |
---|
97 | &old_handler)); |
---|
98 | |
---|
99 | interrupt_table[vector] = old_interrupt; |
---|
100 | old_interrupt = 0; |
---|
101 | old_handler = 0; |
---|
102 | vector = 0; |
---|
103 | caught = false; |
---|
104 | } |
---|
105 | else |
---|
106 | set_status_code(RTEMS_SUCCESSFUL); |
---|
107 | |
---|
108 | return last_status_code(); |
---|
109 | } |
---|
110 | |
---|
111 | void rtemsInterrupt::redirector(rtems_vector_number vector) |
---|
112 | { |
---|
113 | if (interrupt_table[vector]) |
---|
114 | interrupt_table[vector]->handler(); |
---|
115 | } |
---|